Unable to perform Kerberos Authentication on Apache HTTPD

Solution Verified - Updated -


  • I use an environment with Windows clients and a Linux webserver. Active Directory provides Kerberos authentication services. I am able to use Kerberos Authentication with simple apache website, but when configuring Kerberos Authentication on a VirtualHost the authentication is unsuccessful and the logs are showing the following output :

    kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
    kerb_authenticate_user entered with user (NULL) and auth_type Kerberos
    Acquiring creds for HTTP@krbtest
    Verifying client data using KRB5 GSS-API
    Client didn't delegate us their credential
    Warning: received token seems to be NTLM, which isn't supported by the Kerberos module. Check your IE configuration.
    GSS-API major_status:00010000, minor_status:00000000
    gss_accept_sec_context() failed: An unsupported mechanism was requested (, Unknown error
  • How can I use Kerberos authentication for websites, when virtual hosts should be used?


  • Red Hat Enterprise Linux (RHEL)
  • Kerberos
  • Apache HTTPD
    • mod_auth_kerb

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content